lovecoding
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W260426


			
				
					
						
						
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 1. \b 单词边界
        let reg = /\ban\b/ig;
        let str1 = 'an Cat, is Lan Animal';
        console.log(str1.match(reg));
        // const a = {
        //     b: 12
        // }
        // a.b = 11
        // console.log(a)
        // 2. ^ 匹配字母首行
        let reg1 = /^ab/;
        let str2 = 'abbc';
        // console.log(reg1.test(str2))

        // 3. $ 匹配字母尾行
        let reg3 = /ab$/
        // console.log(reg3.test("ababbaa"))

        let reg4 = /^a$/;
        console.log(reg4.test("aaa"))
        console.log(reg4.test("a"))
        console.log(reg4.test(" "))
    </script>
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